It is most common for children to vomit at the time of the fall or within 72 hours, but of course, the actual situation should be judged, mainly by the specific injuries of the child after the fall. Some children will not vomit, while others may vomit at the time, if the vomiting is accompanied by coma or inability to move one side of the limb, it is relatively critical, need to go to the hospital in a timely manner for relevant tests to finalize. Some children may not vomit at the time, but may vomit within 72 hours, which may be a delayed abnormality and require a timely review of the head CT for final clarification. So be sure to observe 72 hours after the fall, if nausea and vomiting occur within 72 hours is an unfavorable situation, timely hospital examination is the most effective.